Dressing

ABSTRACT

In one embodiment, the dressing has a base which is to be adhered to a patient about a catheter site, an aperture in the base to pull a catheter line through and a cover with a window that is folded over and onto the base in a sealed manner. In another embodiment, the dressing has two covers with windows for folding over separate sections of a base to seal in the components of a catheter assembly with multiple catheters extending from a common housing.

This invention relates to a dressing. More particularly, this inventionrelates to a dressing for protecting an indwelling catheter access site.

As is known, various catheters have been attached to patients for theinfusion of pain drugs, chemotherapy, antibiotics, antiviral orantifungal drugs as well as for hydration and nutrition. In some cases,the catheters are required to remain in place for an extended period oftime.

As described in U.S. Pat. Nos. 9,220,869 and 8,778,387, it is known toapply a dressing to a patient's skin to cover a catheter insertion siteat which a catheter punctures a patient's skin.

As described in U.S. Pat. No. 6,998,511, dressings which cover cathetersare generally known. The catheter may be inserted at a site on thepatient and the site may be covered by the dressing. A window, ortransparent film, may be provided within the dressing for viewing of thesite.

As described in U.S. Pat. No. 7,812,212, it is known to provide adressing for protecting a catheter access site as well as an implantedport at the site with a tube from the port extending from under thedressing.

It is known that medical tubing connected to indwelling catheters can besubjected to pulling forces caused by patient movement or by snagging ofthe tubing on other objects. These pulling forces might peel thedressing securing the tubing and/or catheter, infusion needle, etc. offof a patient's skin thereby exposing the catheter site, implanted portor an infusion needle. Also, this may weaken the adhesion between thedressing and the patient's skin, potentially exposing the catheter siteto harmful bacteria.

It is an object of the invention to provide a dressing for protecting acatheter site as well as a catheter extending from the site.

It is another object of the invention to provide a dressing for acatheter site that allows access to a catheter extending from the site.

It is another object of the invention to provide a dressing thatmaintains a catheter extending from a catheter site in a sealedcondition when not in use and which allows ready access to the catheterwhen use is required.

It is another object of the invention to provide a dressing for acatheter site that can be easily applied to a patient and that is easyto manipulate to obtain access to a sealed in place catheter.

Briefly, the invention provides a dressing for a catheter site comprisedof a base for adhering to a patient with an opening for passage of acatheter from the catheter site and a cover that can be folded over andsecured to the base to close in the catheter and that can be peeled fromthe base to allow access to the catheter.

In one embodiment, the base of the dressing is made of a sheet ofmedical grade polyethylene and has an adhesive on an underside foradhering to a patient. The base also has an opening for passage of acatheter therethrough from the catheter site. In addition, a removablesilicone release liner is disposed over the adhesive of the base. Uponuse of the dressing, the release liner is manually removed, the dressingapplied against the skin of a patient to encompass a catheter site andthe catheter passed through the opening of the base.

The dressing may also have a pad disposed on the base over the openingtherein for placement of a catheter thereon. To this end, the pad has aslit extending from one side thereof towards a central area thereof forpassage of the line of the catheter therethrough. The line of thecatheter may then be wound onto itself and placed on the pad.

In this embodiment, the cover is secured to the base for movementbetween an opened position spaced from the base and a closed positionover the base and over the wound-up catheter line on the pad.

The cover has a window for viewing of the base and wound-up catheterline on the pad and a frame secured about a periphery of the window withan adhesive on an outer surface thereof for securement to the base. Inaddition, a removable silicone release liner is disposed over theadhesive of the frame.

The window is made of a breathable urethane with a preformed bubble forencompassing a wound-up catheter line on the pad and a peripheral flangesurrounding the bubble. One side of the flange is secured as by weldingdirectly to the sheet of polyethylene of the base to form a unitarystructure.

The frame is made of polyethylene and is of U-shape that is secured tothree sides of the peripheral flange of the window in order to rigidifythe perimeter of the urethane window for alignment over the base of thedressing.

Upon use of the dressing, after application of the base to a patient andplacement of the catheter line on the pad, the release liner is manuallyremoved from the frame of the cover and the cover folded over the baseso that the U-shaped frame adheres to the base on three sides in asealed manner with the window encompassing the wound-up catheter line onthe pad. Since the window is secured to the base on the fourth side, thewound-up catheter line on the pad can be maintained in a sealedcondition.

In order to administer a drug, or solution or the like to a patient, thecover of the dressing is peeled away from the base while remaininghinged thereto to expose the catheter line. The drug or solution maythen be administered into the catheter line in a conventional manner.After delivery, the cover may be reclosed on the base to again seal inthe catheter line within the window.

Where a patient is “hooked” into an IV line or the like for an extendedtime and there is a need to “unhook” the patient, for example, to take ashower, the cover which is in the opened position while the patient is“hooked in” is folded over the base into the closed position to protectthe catheter line during the shower.

The window of the dressing and the opening in the base allows medicalpersonnel to view the catheter site from time to time.

In another embodiment, the dressing is made for use with a catheter sitehaving a catheter assembly with multiple catheters extending from acommon housing which, in turn, is connected via a single line to thecatheter site.

In this embodiment, the base has a pair of sections defining an L-shapewith an opening disposed in one of the sections and with the coverextending from this section. The base also has a slit extending from theopening to an edge of the base for passage of a catheter line of thecatheter assembly. This embodiment is particularly useful forPeripherally Inserted Central Catheters known as PICCs.

The base is made of a sheet of medical grade polyethylene with anadhesive on an underside for adhering to a patient and a removablesilicone release liner disposed over the adhesive.

The cover is made as in the first embodiment with a window and a framesecured about a periphery of the window with an adhesive on an outersurface for securement to the base and a removable silicone releaseliner disposed over the adhesive.

Upon use of the dressing, the release liner is manually removed from thebase and the dressing applied against the skin of a patient to encompassthe catheter site and the line of the catheter assembly passed throughthe slit in the base and into the opening of the base. The release lineris then manually removed from the frame of the cover and the coverfolded over the base so that the U-shaped frame adheres to the base onthree sides in a sealed manner with the window encompassing the commonhousing of the catheter assembly. The multiple catheters of the assemblyare then laid over the second section of the base.

This embodiment also has a second cover of like construction but alonger length secured to the second section of the base for folding overthe multiple catheters. Upon use, after placement of the multiplecatheters on the second section of the base, the release liner of thesecond cover is removed and the cover folded over and adhered to thebase to place the window of the cover over the multiple catheters. Atthe same time, the frame of the cover seals against the base as well asoverlying one side of the first cover in sealed relation.

The dressing of each embodiment may be made so that base has an enlargedportion at one corner and the cover(s) has a tab for disposition overand within the enlarged portion in closed position of the cover. Thisfacilitates opening of the cover(s) away for the base without risk ofpulling the base from adhesion to a patient.

These and other objects and advantages of the invention will become moreapparent from the following description taken in conjunction with thedrawings wherein:

FIG. 1 illustrates a top view of a dressing made with a base and a coverin accordance with the invention;

FIG. 2 illustrates a top view of the base of the dressing of FIG. 1;

FIG. 3 illustrates a top view of the cover of FIG. 1;

FIG. 4 illustrates an exploded view of the cover of FIG. 3;

FIG. 5 illustrates a bottom view of the dressing of FIG. 4;

FIG. 6 illustrates a view of the dressing of FIG. 1 during applicationto a patient;

FIG. 7 illustrates a view of the dressing of FIG. 4 applied to acatheter site with a catheter line extending through an opening in thebase;

FIG. 8 illustrates a view of the dressing of FIG. 4 with a pad on thebase;

FIG. 9 illustrates a view of a coiled catheter line on the pad on thebase in accordance with the invention;

FIG. 10 illustrates a view of the dressing of FIG. 4 with the coverfolded over the base;

FIG. 11 illustrates a view of the dressing of FIG. 4 during unpeeling ofthe cover from the base;

FIG. 12 illustrates a bottom view of a dressing in accordance with asecond embodiment of the invention;

FIG. 13 illustrates a top view of the dressing of FIG. 12;

FIG. 14 illustrates a partial view of a catheter assembly with multiplecatheters extending from a common housing;

FIG. 15 illustrates a view of the dressing of FIGS. 12 and 13 duringinitial placement over the catheter assembly of FIG. 14;

FIG. 16 illustrates a top view of the dressing of FIG. 12 prior tofolding over of the first cover;

FIG. 17 illustrates a top view of the dressing of FIG. 12 after foldingover of the first cover;

FIG. 18 illustrates a top view of the dressing of FIG. 12 afterplacement of the multiple catheters over the base and prior to foldingover of the second cover;

FIG. 19 illustrates a top view of the dressing of FIG. 12 during removalof the release liner and prior to folding over of the second cover;

FIG. 20 illustrates a top view of the dressing of FIG. 12 after foldingover of the second cover;

FIG. 21 illustrates a part cross-sectional view taken on line 21-21 ofFIG. 20;

FIG. 22 illustrates a view of a dressing similar to FIG. 10 with a basehaving an enlarged portion to receive a tab of the cover; and

FIG. 23 schematically illustrates the dressing of FIG. 22 during openingof a cover.

Referring to FIG. 1, the dressing 20 comprises a base 21 and a cover 22for movement between an opened position spaced from the base 20 and aclosed position over the base 21.

Referring to FIGS. 2 and 6, the base 21 is made of a sheet 23 of medicalgrade polyethylene of generally square or rectangular shape with acentrally located opening 24 and has an adhesive 25 on an underside foradhering to a patient. For example, the base 21 is a single coatedpolyethylene tape 3M-1521.

In addition, the base 21 has a silicone coated release liner 26, suchas, a 3M 1361, disposed over the adhesive 25 of the sheet 23.

Referring to FIGS. 3 and 4, the cover 22 has a preformed transparentwindow 27 made of a breathable urethane of a thickness of 2.5 mil with apreformed bubble 28 and a peripheral flange 29 surrounding the bubble28.

As illustrated in FIG. 4, one side of the flange 29 is wider than theremaining three sides of the flange 29 for securement, as by welding,directly to the sheet 23 of polyethylene of the base 21 as illustratedin FIG. 1 to form a unitary structure. In addition, one corner of theflange 29 is formed as an outwardly projecting tab 30.

The cover 22 also has a U-shaped frame 31 secured to the flange 29 aboutthree sides of the periphery of the window 27 with an adhesive 32 on anouter surface thereof for securement to the base 21. For example, theframe 31 is made of a single coated polyethylene tape, e.g. a 3M 9860,of approximately 0.020 inches thick to provide stability to the window27.

As illustrated in FIG. 4, the frame 31 includes a pair of parallel legs33 that extend over only a portion of the wider side of the flange 29 tobe in abutment with a side of the sheet 23 when the dressing 20 isassembled. (See FIG. 1). The uncovered portion of this side of theflange 29 thus forms a “hinge” for folding of the cover 22 onto and fromthe base 21.

The frame 31 also has a corner that is formed as an outwardly projectingtab 34 that overlies the tab 30 of the window 27.

In addition, the cover 22 has a silicone coated release liner 35, suchas, a Kraft Liner 3M 9968, disposed over the adhesive 32 of the frame31. This liner 35 also has a corner that is formed as an outwardlyprojecting tab 36 that overlies the tab 30 of the window 27 and the tab34 of the frame 31.

Referring to FIGS. 5 and 6, the release liner 26 of the base 21 isformed of three sections, namely a rectangular central section 37 thatis to be first removed when applying the dressing 20 to a patient andtwo side sections 38 that are to remain in place during initialplacement of the dressing 20 on a patient. The two side sections 38allow a user to apply the dressing 20 to a patient without needing totouch the adhesive 25 on the sheet 23.

Referring to FIG. 6, in order to apply the dressing 20 to a cathetersite, the central section 37 of the release liner 26 on the base 21 isremoved.

Referring to FIG. 7, the dressing 20 is then placed over the cathetersite and the catheter 39 at the catheter site is pulled through theopening 24 in the sheet 23, the remaining side sections 38 are thenremoved and the base 21 is adhered to the patient (not shown).

Referring to FIG. 8, a soft foam comfort pad 40 may be disposed on thebase 21 over the opening 24 for placement of the catheter 39 thereon. Asillustrated, the pad 40 has a slit 41 extending from one side thereof toa centrally located aperture 42 for passage of a catheter line 43 of thecatheter 39 therethrough to the aperture 42.

Referring to FIG. 9, after winding up of the catheter line 43 of thecatheter 39 and placement on the pad 40, the release liner 35 on thecover 22 is removed to expose the adhesive 32 and the cover 22 foldedover the base 21 and pressed down on three sides.

Referring to FIG. 10, after folding onto the base 21, the cover 22 sealsagainst three sides of the base 21 via the adhesive 32 while the fourthside of the base 21 is closed by the flange 29 of the window 27. At thistime, the coiled catheter line 43 is encompassed by the window 27 of thecover 22 and may be readily viewed.

Referring to FIG. 11, in order to uncover the catheter line 43, theoverlying tabs 30 (34) are manually grasped and the cover 22 peeled backfrom the base 21. After servicing, the catheter line 43 is again coiledonto the pad 40 and the cover 22 folded back onto the base 21 to enclosethe catheter line 43.

In order to administer a drug, or solution or the like to a patient, thecover 22 of the dressing 20 is peeled away from the base 21 whileremaining hinged thereto to expose the catheter line 43. The drug orsolution may then be administered into the catheter line 43 in aconventional manner. After delivery, the cover 22 may be reclosed on thebase 21 to again seal in the catheter line 43 within the window 27.

Where a patient is “hooked” into an IV line or the like for an extendedtime and there is a need to “unhook” the patient, for example, to take ashower, the cover 22 which is in the opened position while the patientis “hooked in” is folded over the base 21 into the closed position toprotect the catheter line 43 during the shower.

Referring to FIGS. 12 and 13, wherein like reference characters indicatelike parts as above, in another embodiment, the dressing 44 includes abase 45 of L-shape defining two sections 46, 47 with a first cover 48secured to one section 46 of the base 45 and a second cover 49 securedto the other section 47 of the base 44.

The base 45 is made of a sheet 23 of medical grade polyethylene with anopening 24 and has an adhesive 25 on an underside for adhering to apatient. In addition, the base 45 has a silicone coated release liner26, as above, disposed over the adhesive 25 of the sheet 23.

The section 46 to which the first cover 48 is secured has a slit 50extending from the opening 24 to an edge of the base 45 for passage of acatheter line therethrough to the opening.

The first cover 48 is made in a similar manner to the cover 22 describedabove with respect to FIG. 4 having a preformed transparent window 27with a peripheral flange 29 about a bubble 28 and an outwardlyprojecting tab 30 on the flange 29, a U-shaped frame 31 secured aboutthree sides of the periphery of the window 27 with an adhesive 32 (seeFIG. 16) on an outer surface thereof for securement to the base 45 and aremovable release liner 35 over the adhesive 32 on the frame 31.

The frame 31 also has a corner that is formed as an outwardly projectingtab (not shown) that overlies the tab 30 (see FIG. 12) of the window 27.

In addition, the liner 35 also has a corner that is formed as anoutwardly projecting tab 36 (FIG. 12) that overlies the tab 30 (FIG. 11)of the window 27 and the tab of the frame 31.

The second cover 49 is similar to the first cover 48 having a preformedtransparent window 27′ of medical grade plastic with a peripheral flange29′ about a bubble 28′, a U-shaped frame 31′ secured about three sidesof the periphery of the window 27′ with an adhesive 32 (see FIG. 19) onan outer surface thereof for securement to the base 45 and a removablerelease liner 35′ over the adhesive 32 on the frame 31′.

The second cover 49 is of an elongated rectangular shape and the window27′ has a pair of outwardly projecting tabs 30′ at two corners of theflange 29′.

The frame 31′ also has a pair of outwardly projecting tabs (not shown)at two corners that overlie the tabs 30′ of the window 27′.

In addition, the liner 35′ also has a pair of outwardly projecting tabs36 at two corners that overlie the tabs of the window 27′ and the tabs30′ of the frame 31′.

Referring to FIG. 14, the catheter assembly 52 has multiple catheters 53extending from a common housing 54 which, in turn, is connected via asingle line 55 to a catheter site (not shown).

Referring to FIG. 15, in use, the dressing 44 is constructed to protectthe catheter assembly 52 at a catheter site, for example, on the arm ofa patient.

As above, in order to apply the dressing 44 to a catheter site, therelease liner 26 on the base 45 is removed (see FIG. 12), the dressing44 is placed over the catheter site and the catheter line 55 from thecatheter site is pulled through the slit 50 to the opening 24 in thefirst section 46 of the sheet 23. At this time, the housing 54 is laidon the section 46 and the multiple catheters 53 laid across the section46.

Next, as indicated in FIG. 16, the release liner 35 on the cover 48 isremoved to expose the adhesive 32 on the frame 31′ and the cover 48folded over the base 45 and pressed down on three sides.

Referring to FIG. 17, after folding onto the base 45, the cover 48 sealsagainst two sides of the base section 46 via the adhesive 32 on theframe 31′ and over the multiple catheters 53 onto the base section 46.As illustrated, the flange 29 wider on side that holds the lines of thecatheters 53 in place. The wider flange increases the adhesive surfacearea and makes the flange stronger and holds the catheters more securelyin place.

As illustrated, the cover 48 is of a length approximately equal to thewidth of the section 46 of the sheet 23 of the base 45. Thus, theoverlying tabs of the frame 31′ and the window 27′ project beyond thebase section 46.

Referring to FIGS. 18 and 19, thereafter, the multiple catheters 55 arelaid over the second section 47 of the sheet 23 of the base 45 and therelease liner 35′ removed from the frame 31′ of the second cover 49 toexpose the adhesive 32 thereon. Next, the second cover 49 is folded overthe multiple catheters 55 to seal against the second section 47 of thesheet 23 of the base 45.

As illustrated in FIGS. 20 and 21, the frame 31′ not only seals againstthe second section 47 of the base 45 but also over the side of the firstcover 48 covering the multiple catheters 55 to seal any openingstherebetween. In addition, the tabs 30′ of the window 27′ extendsoutwardly of the base 45.

Should a need arise to gain access to the catheters 55, the second cover49 is peeled away from the closed position of FIG. 20 to an openedposition such as shown in FIG. 19. Thereafter, the second cover 49 isagain pressed onto the base 45 to seal the catheters 55 from thesurrounding environment.

Similarly, should a need arise to gain access to the housing 54, bothcovers 48, 49 are peeled away to opened positions.

Referring to FIGS. 22 and 23 wherein like reference characters indicatelike parts as above, the dressing 20 may be made with a base 21 havingan enlarged portion 21′ at one corner thereof and with the cover 22having a tab 22′ for disposition over and within the enlarged portion21′ in closed position (FIG. 22). The tab 22′ is releaseably secured tothe enlarged portion 21′ to remain flat and secure. In order to open thedressing 20, the tab 22′ is peeled back from the base 21 (FIG. 23) whilethe user holds the enlarged portion 21′ down against the patient. Thus,the cover 22 may be peeled away for the base 21 without risk of pullingthe base from adhesion to a patient.

The embodiment of FIGS. 12 to 21 may be made with similar tabs. Forexample, one section 46 of the base 45 may have an enlarged portion atone corner and the first cover 48 would have a tab for disposition overand within enlarged portion in the closed position thereof. The othersection 47 of the base 45 would have an enlarged portion at the cornerwhere the tab 30′ of the window 27′ and tab 36′ of the frame 35′ overliethe base section 47.

The invention thus provides a dressing that maintains a catheterextending from a catheter site in a sealed condition when not in use andwhich allows ready access to the catheter when use is required. Further,the invention provides a dressing that can be easily applied to apatient, that is easy to manipulate to obtain access to a sealed inplace catheter and that protects a catheter site as well as a catheterextending from the site.

What is claimed is:
 1. A dressing for a catheter site comprising a basehaving an adhesive on an underside thereof for adhering to a patient andan opening for passage of a catheter therethrough from the cathetersite; and a cover secured to said base for movement between an openedposition spaced from said base and a closed position over said base,said cover having a window for viewing of said base and a frame securedabout a periphery of said window with an adhesive on an outer surfacethereof for securement to said base.
 2. A dressing as set forth in claim1 wherein said opening in said base is located centrally of said baseand said window of said cover is located centrally of said cover.
 3. Adressing as set forth in claim 1 wherein said window has a bubble forpositioning over and encasing a catheter on said base.
 4. A dressing asset forth in claim 1 further comprising a pad disposed on said base oversaid opening therein for placement of a catheter thereon, said padhaving a slit extending from one side thereof towards a central areathereof for passage of a catheter line therethrough.
 5. A dressing asset forth in claim 1 wherein said frame of said cover has an outwardlyextending tab at one corner thereof for manual peeling of said coverfrom said base from said closed position to said opened position.
 6. Adressing as set forth in claim 1 wherein said base is made of a medicalgrade polyethylene, said frame of said cover is made of medical gradepolyethylene and said window is made of polyurethane.
 7. A dressing asset forth in claim 1 further comprising a removable silicone releaseliner over said adhesive of said frame.
 8. A dressing as set forth inclaim 1 further comprising a removable silicone release liner over saidadhesive of said base.
 9. A dressing as set forth in claim 1 whereinsaid adhesive of said cover is peelable from said adhesive of said base.10. A dressing as set forth in claim 1 wherein said window is made of abreathable urethane.
 11. A dressing as set forth in claim 1 furthercomprising a pad disposed on said base over said opening therein forplacement of a catheter thereon, said pad having a slit extending fromone side thereof towards a central area thereof for passage of acatheter line therethrough.
 12. A dressing as set forth in claim 1wherein said base has a slit extending from said opening to an edge ofsaid base for passage of a catheter line therethrough.
 13. A dressing asset forth in claim 12 wherein said base has a pair of sections definingan L-shape with said opening being disposed in one of said sections andwith said cover extending from said one section.
 14. A dressing as setforth in claim 13 further comprising a second cover of medical gradeplastic secured to the other of said sections of said base for movementbetween an opened position spaced from said base and a closed positionover said base, said second cover having a frame with an adhesivethereon for securement to said base, a window within said frame forviewing said base and a removable release strip over said adhesive ofsaid frame.
 15. A dressing as set forth in claim 1 wherein said base hasan enlarged portion at one corner thereof and said cover has a tab fordisposition over and within said enlarged portion in said closedposition.
 16. A dressing for a catheter site comprising a base includinga sheet of medical grade polyethylene having an adhesive on an undersidethereof for adhering to a patient and an opening for passage of acatheter therethrough from the catheter site and a removable siliconerelease liner disposed over said adhesive of said sheet; and a coverhaving a preformed window of polyurethane of rectangular shape, aU-shaped polyethylene frame secured to a periphery of said window and anadhesive on a surface thereof for securement to said base and aremovable silicone release liner disposed over said adhesive of saidframe; said cover being secured to said base for movement between anopened position spaced from said base and a closed position over saidbase.
 17. A dressing as set forth in claim 16 wherein one side edge ofsaid window is secured to and over one side of said sheet and saidU-shaped polyethylene frame includes a pair of parallel legs in abutmentwith said one side of said sheet.
 18. A dressing for a catheter sitehaving a catheter assembly with multiple catheters extending therefromcomprising a base having an adhesive on an underside thereof foradhering to a patient, a pair of sections defining an L-shape, anopening in one of said sections for passage of a catheter line of thecatheter assembly therethrough from the catheter site and a slitextending from said opening to an edge of said base for passage of thecatheter line therethrough to said opening; a first cover of medicalgrade plastic secured to said one section of said base for movementbetween an opened position spaced from said base and a closed positionover said base, said cover having a frame with an adhesive thereon forsecurement to said base, a window within said frame for viewing saidbase and the catheter line thereon and a removable release strip oversaid adhesive of said frame; and a second cover of medical grade plasticsecured to another section of said pair of sections of said base formovement between an opened position spaced from said base and a closedposition over said base, said cover having a frame with an adhesivethereon for securement to said base, a window within said frame forviewing said base and a multiple catheters of the catheter assemblythereon and a removable release strip over said adhesive of said frame.19. A dressing as set forth in claim 18 wherein said second coveroverlies one side of said first cover in sealed relation in said closedposition of said second cover.
 20. A dressing as set forth in claim 19wherein said frame of said first cover has an outwardly extending tab atone corner thereof for manual peeling of said first cover from said basefrom said closed position to said opened position and said second coverhas a first outwardly extending tab at a corner disposed over said firstcover in said closed position of said second cover and a secondoutwardly extending tab at a corner spaced from said first cover.
 21. Adressing as set forth in claim 18 wherein said window of said firstcover is made of urethane with a bubble for positioning over a catheterline on said base. and said window of said second cover is made ofurethane with a bubble for positioning over multiple catheters of thecatheter assembly on said base.
 22. A dressing as set forth in claim 18wherein said one section of said base has an enlarged portion at onecorner thereof and said first cover has a tab for disposition over andwithin said enlarged portion in said closed position thereof.